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herti
Bacalah dengan seksama LKPD Isilah dengan benar sesuai dengan langkah yang diberikan Diskusikan dengan teman sekelompokmu dengan baik Tanya kepada guru jika ada yang kurang
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KEGIATAN 1
Segitiga Segitiga siku-siku siku-siku CDE jika diperbe diperbesar sar menjadi menjadi segitiga segitiga ABC, dan jika diperkecil menjadi segitiga CFG Sehingga Sehingga
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KEGIATAN 2 Ayo perhatikan alat peraga lingkaran berjari-jari 1 satuan dibawah ini PETUNJUK
1. Tariklah sisi jari-jari berwarna biru membentuk sudut 30 2. Isilah lingkaran pada sumbu-y dengan angka dibawah ini
√
30
√
Berdasarkan hasil pengukuran pada kegiatan 1, lengkapilah :
sin30 =
ℎ
cos30 =
ℎ
=
………. ………..
=
………
= ………
………. ………..
………
= ………
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Berdasarkan hasil pengukuran pada kegiatan 3, lengkapilah :
sin 60 sin
cos 60
..........
hijau
biru
.........
merah
tan 60
cos ec 60
sec 60
cot 60
hijau
merah
hijau
.........
..........
.........
..........
.........
..........
merah
.........
biru
..........
..........
biru
.........
merah
.........
..........
hijau
biru
..........
.........
.........
..........
..........
..........
.........
..........
.........
.........
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Keep fighting
Bentuklah sudut dengan menggunakan jari-jari yang berwarna biru
PETUNJUK
… …
sin 90 =
cos 900 =
… …
tan 900 =
… …
cosec 900 =
sec 900 =
cotan 900 =
90
… …
… … … …
Note: sisi merah selalu berada pada sumbu x
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Keep fighting
Bentuklah sudut dengan menggunakan jari-jari yang berwarna biru
PETUNJUK
sin 0 =
cos 00 =
… …
tan 00 =
… …
cosec 00 =
sec 00 =
… …
… …
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KESIMPULAN
Dari sebuahsegitiga siku-sikudengan siku-sikudengan sudut
α,
dapat ditentukan enam buah
perbandingan yang disebut perbandingan-perbandingan trigonometri pada segitiga siku-siku, yaitu sebagai berikut: Sin Cos Tan Cosec Sec Cotan Sind emi ) (Cosami ) (Tandesa) ( Si nde
=
………… ….…….
=
………… ….…….
=
………… ….…….
=
………… ….…….
=
………… ….…….
=
………… ….…….
Dengan menggunakan konsep perbandingan trigonometri pada segitiga sikusiku, dapat ditentukan nilai perbandingan trigonometri untuk sudut istimewa, yaitu sebagai berikut: Sin 0º 30º 45º 60º 90º
Cos
Tan
Csc
Sec
Cot
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